EP3648889A1 - Procédé de traitement de cendres volantes et installation et procédé de production de ciment - Google Patents

Procédé de traitement de cendres volantes et installation et procédé de production de ciment

Info

Publication number
EP3648889A1
EP3648889A1 EP18737213.1A EP18737213A EP3648889A1 EP 3648889 A1 EP3648889 A1 EP 3648889A1 EP 18737213 A EP18737213 A EP 18737213A EP 3648889 A1 EP3648889 A1 EP 3648889A1
Authority
EP
European Patent Office
Prior art keywords
fly ash
ground
ball mill
grinding
mill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP18737213.1A
Other languages
German (de)
English (en)
Inventor
Guido Kache
Michael Wilczek
Björn-Olaf ASSMANN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssenkrupp Polysius GmbH
ThyssenKrupp AG
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp AG, ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp AG
Publication of EP3648889A1 publication Critical patent/EP3648889A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Definitions

  • the invention relates to a process for the processing of fly ash and a plant and a method for the production of cement.
  • fly ash falls in firing systems, such as in a waste incineration plant, in large quantities.
  • flyashes have widely varying densities, which can lead to problems in process behavior.
  • the glassy reimbursed, spherically formed, fine fly ash particles as solid spheres, hollow spheres (cenospheres) and particle-filled hollow spheres (plerospheres) can occur and vary from fly ash to fly ash.
  • the cement plant operators have to process fly ashes of different coal-fired power plants and are therefore confronted with highly fluctuating qualities.
  • the invention is therefore based on the object of specifying a method for processing fly ash and a plant for the production of cement, whereby the fly ash can be easily incorporated into the cement production process. According to the invention this object is solved by the features of claims 1 and 7.
  • the inventive method for processing fly ash is characterized by a grinding of the fly ash in a dry-stirred ball mill.
  • the plant according to the invention for the production of cement has at least one first grinding step consisting of a first mill and a first classifier for grinding cement clinker and furthermore provides a dry-driven agitator ball mill for refining fly ash and at least one discharge device for the common discharge and / or joint storage of the cement ground cement clinker and ground fly ash.
  • Agitator ball mills have a fixed housing in contrast to ball mills.
  • the activation of the fly ash is also in the agitator ball mill by the action of the balls located inside the mill on the fly ash. While the balls of a conventional ball mill are accelerated essentially only by the gravitational attraction, the balls in an agitating ball mill are given an additional impulse by the rotating stirrer, which results in a higher force input.
  • a further energy savings in the activation of the fly ash is also achieved in that the agitator ball mill is operated dry, as a subsequent drying of the material is unnecessary.
  • Fly ash is already present as a starting material in a relatively fine size ( ⁇ 500 ⁇ ).
  • the agitating ball mill can be equipped with correspondingly small grinding bodies (for example in the range from 2 mm to 15 mm, preferably 4 mm to 6 mm.)
  • agitator ball mills are considerably more compact than conventional ball mills, since a large part of the grinding energy is due to the Agitator is introduced.
  • the fly ash in the agitator ball mill is ground to a final fineness of at least 45 ⁇ . Furthermore, it is expedient if the fly ash is ground in one pass through the agitator ball mill to the desired final fineness. In this way, the apparatus required by avoiding a classifier and associated conveyors is reduced accordingly.
  • the fly ash should preferably have a content of reactive silicon dioxide of at least 25% by weight and a content of reactive calcium oxide of less than 15% by weight.
  • the agitating ball mill is operated so that the fly ash is ground to a fineness with a specific Blaine surface area of at least 5,000 cm 2 / g.
  • the plant for producing cement may further comprise a second milling stage comprising at least one second mill cooperating with a second sifter or with the first sifter.
  • the agitator ball mill provides an input port for supplying the fly ash and an outlet port for discharging the fly ash, wherein the outlet port is preferably in communication with the trigger device.
  • a material divider with an input, a first output and a second output can be provided, the Auslassöffhung the agitator ball mill with the input of the material divider, the first output with the trigger and the second output with the second mill of the second grinding stage in conjunction.
  • a part or all of the processed fly ash can be ground together with the cement clinker in the second grinding step and thereby intimately mixed.
  • the invention further relates to a method for grinding cement, wherein cement clinker and at least one other additive (such as gypsum, granulated slag, etc.) are ground in at least a first milling stage and fly ash is ground in a dry-stirred ball mill, wherein the ground cement clinker with the at least another additive and the ground fly ash are mixed together.
  • cement clinker and at least one other additive such as gypsum, granulated slag, etc.
  • FIG. 1 is a schematic representation of a plant according to the invention for the production of cement with a dry-driven agitator ball mill for grinding fly ash according to a first embodiment
  • Fig. 2 is a schematic representation of a plant according to the invention for the production of cement with a dry-stirred ball mill for grinding fly ash according to a second embodiment
  • Fig. 3 is a schematic representation of the dry-driven agitator ball mill for grinding the fly ash.
  • the plant shown in Fig. 1 for the production of cement consists essentially of a first grinding stage 1, a second grinding stage 2 for grinding cement clinker and a dry-stirred ball mill 3 for grinding fly ash.
  • the first grinding stage 1 provides a first mill 10 designed here as a good-bed roller mill, a first separator 11 and a cyclone separator 12.
  • the first classifier 11 is designed as a static-dynamic classifier and provides a static classifier I Ia and a dynamic classifier I Ib.
  • the material to be sighted is first of all discharged via an inlet 11c to the static classifier I 1a, which has, for example, an aeration floor arranged in an oblique or stepped manner, through which the classifying air 4 flows transversely.
  • the coarse material 5 of the static classifier I Ia passes into the first mill 10, where it is comminuted and returned to the inlet 11c of the static classifier I Ia by means of a conveying device 13 designed, for example, as a bucket elevator.
  • the fines of the static classifier I Ia passes together with the classifying air 4 in the dynamic classifier I Ib, which is usually operated with a classifying rotor.
  • the grits 6 of the dynamic classifier I 1b pass into a second mill 20 of the second grinding stage 2, designed as a ball mill, for example.
  • the fines of the dynamic classifier I 1b are discharged together with the classifying air 4 and supplied to the cyclone separator 12. There, the fine material 7 is discharged as finished cement clinker via a take-off device 14.
  • the separated classifying air 4 is partly recirculated back to the static classifier I Ia or, alternatively, freed from the residual dust 8 in a dust filter 15, which is then together with the ground fine material 7 is discharged via the discharge device 14.
  • the material to be ground in the first grinding stage 1 is composed of cement clinker 40 and at least one further additive 41, such as granulated slag or gypsum.
  • the material to be crushed is first supplied via the first conveyor 13 to the static separator I Ia. It would also be conceivable that the material is fed directly to the first mill 10.
  • the grits 6 are further comminuted in the second mill 20 and pass via a second conveyor 21 via a second inlet 11d of the first classifier 11 into the dynamic classifier 11b.
  • the material ground in the second mill could also be recirculated to the first inlet 11c of the first classifier.
  • the second mill 20 could interact with a separate classifier.
  • the device for processing fly ash 9 has at least one collecting container 30 for the fly ash 9 to be shredded and one
  • the agitating ball mill 31 has an input port 31 a communicating with the header tank 30. Furthermore, an outlet opening 31b is provided, which is connected to the discharge device 14 for the common discharge of the ground cement clinker (fines 7) and the ground fly ash 9. Between the collecting container 30 and the
  • a first material divider 32 for bypassing the agitator ball mill can be provided in the inlet opening 31a of the stirred ball mill. In this way it is possible that some or all of the fly ash is mixed with the ground cement clinker without further comminution. This will be especially provided when the fly ash is already in sufficient quality and fineness.
  • the first material divider 32 can also be adjusted so that a part of the fly ash is ground, while another part is mixed with the ground cement clinker 7 without further activation.
  • a material separator in the form of a filter
  • the separated in the filter 36 fly ash is the input 33 a of the second material divider 33, while the separated in the filter 36 conveying air is discharged as exhaust air.
  • the second material divider also has a first outlet 33b, which communicates with the draw-off device 14.
  • the second outlet 33 c is connected via an intermediate container 34 to an inlet 20 a of the second mill 20.
  • a third material divider 35 is provided between the intermediate container 34 and the second mill 20, with which the fly ash from the intermediate container 34, bypassing the second mill 20, is first fed to the first classifier 11.
  • the material comminuted in the second mill 20 is discharged via the outlet 20b and passes via the second conveyor 21 into the first classifier 11, alternatively into a separate classifier. If the second mill 20 is operated with an air flow, the separation between air and material initially takes place in a further dust separator 22, wherein the separated material passes into the first classifier 11 via the second conveying device 21.
  • the ground cement clinker (fines 7 of the first classifier 11) is already mixed on the discharge device 14 with the fly ash 9. Both components are also promoted together in a collecting container, not shown. In the context of the invention, it is also conceivable that the ground cement clinker 7 and the fly ash 9 are transported via separate conveyors to a common storage.
  • Fig. 2 shows a second embodiment of a plant for the production of cement with a dry-driven agitator ball mill for refining fly ash.
  • the difference from the first embodiment is that the filter 36 of FIG. 1 has been replaced by a cyclone 37 in FIG.
  • the cyclone 37 in FIG.
  • FIGS. 1 and 2 show an enlarged view of the agitator ball mill 31 according to FIGS. 1 and 2.
  • the agitator ball mill 31 has a fixed housing 31c and an agitator 31e driven in the interior of the housing via a motor 3 ld.
  • the agitator ball mill is operated with grinding bodies 31f, in particular grinding balls.
  • the fly ash 9 to be shredded is metered into the area of the input opening 31a via a rotary feeder 31g.
  • the activation or conditioning of the fly ash takes place essentially by the contact with the grinding bodies 31f, which are lifted and accelerated by the agitator 31e.
  • a discharge rotor 31h co-rotating with the agitator, which separates the conditioned fly ash from the grinding bodies 31f.
  • conveying air 42 is supplied for discharging the conditioned fly ash.
  • This conveying air 42 flows into the discharge rotor 31h and discharges the conditioned fly ash via the discharge port 31b.
  • at least one further conveying air opening 31 j can also be provided in the region of the outlet opening 31 b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Crushing And Grinding (AREA)

Abstract

Le procédé de traitement de cendres volantes de la présente invention est caractérisé par un broyage des cendres volantes dans un broyeur à boulets fonctionnant à sec. L'installation de l'invention destiné à la production de ciment comprend au moins un premier étage de broyage comprenant un premier broyeur et un premier séparateur et destiné à broyer le ciment, et prévoit en outre un broyeur à boulets fonctionnant à sec destiné à broyer les cendres volantes et au moins un dispositif d'évacuation destiné à évacuer et/ou stocker conjointement le clinker de ciment broyé et les cendres volantes broyées.
EP18737213.1A 2017-07-04 2018-06-29 Procédé de traitement de cendres volantes et installation et procédé de production de ciment Pending EP3648889A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017114831.0A DE102017114831A1 (de) 2017-07-04 2017-07-04 Verfahren zur Aufarbeitung von Flugasche sowie Anlage und Verfahren zur Herstellung von Zement
PCT/EP2018/067597 WO2019007838A1 (fr) 2017-07-04 2018-06-29 Procédé de traitement de cendres volantes et installation et procédé de production de ciment

Publications (1)

Publication Number Publication Date
EP3648889A1 true EP3648889A1 (fr) 2020-05-13

Family

ID=62816538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18737213.1A Pending EP3648889A1 (fr) 2017-07-04 2018-06-29 Procédé de traitement de cendres volantes et installation et procédé de production de ciment

Country Status (4)

Country Link
EP (1) EP3648889A1 (fr)
CN (1) CN110831698A (fr)
DE (1) DE102017114831A1 (fr)
WO (1) WO2019007838A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019008945B4 (de) * 2019-12-20 2022-03-24 Udo Enderle Verfahren zur Aufarbeitung von Flugasche
DE102020100249A1 (de) 2020-01-08 2021-07-08 Thyssenkrupp Ag Integriertes Verfahren zur kommerziellen und industriellen Verwertung von Kalziumsulfat unter Gewinnung von Seltenen Erden aus der Phosphorsäureproduktion
DE102020100260A1 (de) 2020-01-08 2021-07-08 Thyssenkrupp Ag Integriertes Verfahren zur Herstellung von Schwefelsäureprozess-geeigneter Schwefeldioxidqualität aus Kalziumsulfat/Phosphorgips aus der Phosphorsäureproduktion
DE102020100238A1 (de) 2020-01-08 2021-07-08 Thyssenkrupp Ag Integriertes Verfahren zur kommerziellen und industriellen Verwertung von Kalziumsulfat aus der Phosphorsäureproduktion
DE102020100254A1 (de) 2020-01-08 2021-07-08 Thyssenkrupp Ag Integriertes Verfahren zur Herstellung eines Baustoffs aus Phosphorgips
DE102020100241A1 (de) 2020-01-08 2021-07-08 Thyssenkrupp Ag Verfahren zur Herstellung von Phosphorsäure und Klinkerprozess-geeigneter Kalziumsulfatqualität zur kommerziellen und industriellen Verwertung von Kalziumsulfat
DE102021108322A1 (de) 2021-04-01 2022-10-06 EEW Energy from Waste GmbH Bindemittel für Baustoffe, Herstellungsverfahren dafür und Anlage zur Ausführung dieses Verfahrens

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SE524393C2 (sv) * 2002-11-07 2004-08-03 Procedo Entpr Ets Metod för behandling av flygaska
JP2005246204A (ja) * 2004-03-03 2005-09-15 Kubota Construction Co Ltd 粉砕用ボールを用いた粉砕方法
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Also Published As

Publication number Publication date
DE102017114831A1 (de) 2019-01-10
WO2019007838A1 (fr) 2019-01-10
CN110831698A (zh) 2020-02-21

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